MSD Ignition MSD 6M-2L Marine Ignition Features: With A Built In Adjustable Rev Limiter Below 3000 RPM A Series Of Multiple Sparks Burn This Ensures Complete Combustion Produce Easier Starting/Greater Throttle Response Reduced Plug Fouling During Prolonged Idling Unit Is Potted To Protect Electrical Components Weather Tight Connectors UL Tested To Meet Safty Stand For Marine Ignitions Height: 2.80 Width: 7.90 Length: 10.80 Weight: 5.60 lbs